Sitting almost exposed in the hollow of the curious hill behind the Hellfire Club in Dublin, a dark chunk of blazing rock served as a convenient border to many bonfires over the centuries. Ironically, the people who probably enjoyed the warmth of the fire while lying up against the comfortably curved bank of the mound probably never understood the significance of the mound they rested upon. After thousands of years going unnoticed, the archaeologists who carried out the first-ever excavation of a passage tomb site at the notorious Hellfire Club in Dublin, eventually announced that the mound that offered rest to many people throughout the centuries, was the remains of an ancient tomb, and that ordinary looking dark stone was carved with symbols and designs that are over 5,000 years old.